(under subclass 201) Subject matter wherein the photocell detects a material having a cross-sectional dimension which is small compared to length and produces an electrical output which through additional structure controls the position, size or speed of the material.
SEE OR SEARCH THIS CLASS, SUBCLASS:
559.01+, for a web, strand, strip or sheet in the optical path including circuitry for analyzing the photocell output.
SEE OR SEARCH CLASS
356, Optics: Measuring and Testing,
364+, for the examination of materials using polarized light; subclass 371 for flatness tests; subclasses 372+ for the measurement of dimensions; subclass 399 for determining lateral alignment; subclasses 402+ for shade or color tests; subclasses 432+ for determining light transmission or
absorption of materials; subclasses 445+ for measuring the reflectivity of materials; and subclasses 237.1+ for the inspection for flaws or imperfections.
